Most of the colleges in town have free entrance fees. I'd recommend Christ's College on Saint Andrew's Street in the centre. It has free admission.
Cool, I also need a train ticket leaving london liverpool st and I am going to cambirdge
attraction-area attraction-name attraction-type train-departure train-destination
attraction-area attraction-name attraction-type train-departure train-destination
attraction-area attraction-name attraction-type train-departure train-destination
attraction-area attraction-name attraction-type train-departure train-destination